The invention discloses a preparation method for a flame-retardant polymer-based automobile damping pad, belonging to the technical field of preparation of damping materials, specially to the preparation method for the flame-retardant polymer-based automobile damping pad. The flame-retardant polymer-based automobile damping pad comprises the following components in parts by weight: 20 to 30 partsof a thermoplastic polyurethane elastomer (TPU), 1 to 5 parts of linear low-density polyethylene (LLDPE), 70 to 100 parts of natural zeolite, 5 to 10 parts of a flame retardant, 1 to 5 parts of an antistatic agent, 0.1 to 0.5 part of an antioxidant, 0.1 to 0.3 part of oleamide and 0.1 to 0.5 part of polyethylene wax. The preparation method comprises the following steps: uniformly mixing the above-mentioned materials in a high-speed mixer, then adding an obtained mixture into a double screw extruder, carrying out melt extrusion so as to obtain an extrudate, i.e., a thermoplastic polyurethane elastomer composite material with a flame retardant function, and subsequently carrying out processing and molding so as to prepare a needed flame-retardant polymer based automobile damping pad. The flame-retardant polymer-based automobile damping pad provided by the invention has the advantages of low production cost, good processing performance and good flame retardancy; and through addition of the natural zeolite with a porous structure to absorb heavy smoke released in the flame retardation process of a flame retardant , the use safety of the automobile damping pad is effectively improved.